[for-next PATCH 00/10] RDMA/rxe: Add RDMA FLUSH operation

[Li Zhijian]

Changes in V7:
- rebase to jgg-for-next(Atomic Write applied)
- patch-09: enable FLUSH QP attribute for supported device only, and remove RVB # Jason
- patch-04: pr_debug -> rxe_dbg_mr # Jason

Changes in V6:
- rebase to v6.1-rc1
- add Yanjun's reviewed-by expect "Allow registering persistent flag for pmem MR only"
- minimize pmem checking side effect # Jason
- return EOPNOSUPP if HCA doesn't support flush operation

These patches are going to implement a *NEW* RDMA opcode "RDMA FLUSH".
In IB SPEC 1.5[1], 2 new opcodes, ATOMIC WRITE and RDMA FLUSH were
added in the MEMORY PLACEMENT EXTENSIONS section.

This patchset makes SoftRoCE support new RDMA FLUSH on RC service.

pyverbs tests and blktests(nvme over RDMA and srp) are tested.

You can verify the patchset by building and running the rdma_flush example[2].
server:
$ ./rdma_flush_server -s [server_address] -p [port_number]
client:
$ ./rdma_flush_client -s [server_address] -p [port_number]

Corresponding pyverbs and tests(tests.test_qpex.QpExTestCase.test_qp_ex_rc_rdma_flush)
are also added to rdma-core

[1]: https://www.infinibandta.org/wp-content/uploads/2021/08/IBTA-Overview-of-IBTA-Volume-1-Release-1.5-and-MPE-2021-08-17-Secure.pptx
[2]: https://github.com/zhijianli88/rdma-core/tree/rdma-flush-v5

CC: Xiao Yang <yangx.jy@xxxxxxxxxxx>
CC: "Gotou, Yasunori" <y-goto@xxxxxxxxxxx>
CC: Jason Gunthorpe <jgg@xxxxxxxx>
CC: Zhu Yanjun <zyjzyj2000@xxxxxxxxx>
CC: Leon Romanovsky <leon@xxxxxxxxxx>
CC: Bob Pearson <rpearsonhpe@xxxxxxxxx>
CC: Mark Bloch <mbloch@xxxxxxxxxx>
CC: Wenpeng Liang <liangwenpeng@xxxxxxxxxx>
CC: Tom Talpey <tom@xxxxxxxxxx>
CC: "Gromadzki, Tomasz" <tomasz.gromadzki@xxxxxxxxx>
CC: Dan Williams <dan.j.williams@xxxxxxxxx>
CC: linux-rdma@xxxxxxxxxxxxxxx
CC: linux-kernel@xxxxxxxxxxxxxxx

Can also access the kernel source in:
https://github.com/zhijianli88/linux/tree/rdma-flush-v7
Changes log
V6: https://lore.kernel.org/lkml/20221116081951.32750-10-lizhijian@xxxxxxxxxxx/T/
V5: https://lore.kernel.org/lkml/20220927055337.22630-12-lizhijian@xxxxxxxxxxx/t/
V4:
- rework responder process
- rebase to v5.19+
- remove [7/7]: RDMA/rxe: Add RD FLUSH service support since RD is not really supported

V3:
- Just rebase and commit log and comment updates
- delete patch-1: "RDMA: mr: Introduce is_pmem", which will be combined into "Allow registering persistent flag for pmem MR only"
- delete patch-7

V2:
RDMA: mr: Introduce is_pmem
   check 1st byte to avoid crossing page boundary
   new scheme to check is_pmem # Dan

RDMA: Allow registering MR with flush access flags
   combine with [03/10] RDMA/rxe: Allow registering FLUSH flags for supported device only to this patch # Jason
   split RDMA_FLUSH to 2 capabilities

RDMA/rxe: Allow registering persistent flag for pmem MR only
   update commit message, get rid of confusing ib_check_flush_access_flags() # Tom

RDMA/rxe: Implement RC RDMA FLUSH service in requester side
   extend flush to include length field. # Tom and Tomasz

RDMA/rxe: Implement flush execution in responder side
   adjust start for WHOLE MR level # Tom
   don't support DMA mr for flush # Tom
   check flush return value

RDMA/rxe: Enable RDMA FLUSH capability for rxe device
   adjust patch's order. move it here from [04/10]

Li Zhijian (10):
  RDMA: Extend RDMA user ABI to support flush
  RDMA: Extend RDMA kernel verbs ABI to support flush
  RDMA/rxe: Extend rxe user ABI to support flush
  RDMA/rxe: Allow registering persistent flag for pmem MR only
  RDMA/rxe: Extend rxe packet format to support flush
  RDMA/rxe: Implement RC RDMA FLUSH service in requester side
  RDMA/rxe: Implement flush execution in responder side
  RDMA/rxe: Implement flush completion
  RDMA/cm: Make QP FLUSHABLE for supported device
  RDMA/rxe: Enable RDMA FLUSH capability for rxe device

 drivers/infiniband/core/cm.c            |  13 +-
 drivers/infiniband/sw/rxe/rxe_comp.c    |   4 +-
 drivers/infiniband/sw/rxe/rxe_hdr.h     |  47 +++++++
 drivers/infiniband/sw/rxe/rxe_loc.h     |   1 +
 drivers/infiniband/sw/rxe/rxe_mr.c      |  58 ++++++++-
 drivers/infiniband/sw/rxe/rxe_opcode.c  |  17 +++
 drivers/infiniband/sw/rxe/rxe_opcode.h  |  14 ++-
 drivers/infiniband/sw/rxe/rxe_param.h   |   2 +
 drivers/infiniband/sw/rxe/rxe_req.c     |  15 ++-
 drivers/infiniband/sw/rxe/rxe_resp.c    | 160 +++++++++++++++++++++---
 drivers/infiniband/sw/rxe/rxe_verbs.h   |   6 +
 include/rdma/ib_pack.h                  |   3 +
 include/rdma/ib_verbs.h                 |  18 ++-
 include/uapi/rdma/ib_user_ioctl_verbs.h |   2 +
 include/uapi/rdma/ib_user_verbs.h       |  17 +++
 include/uapi/rdma/rdma_user_rxe.h       |   7 ++
 16 files changed, 352 insertions(+), 32 deletions(-)

-- 
2.31.1